Author(s): Luiz, Vitor H. M. [UNESP] ; Saraiva, Lívia M. [UNESP] ; Martins, Ângela P. [UNESP] ; Pezza, Leonardo [UNESP] ; Pezza, Helena R. [UNESP]
Date: 2018
Persistent ID: http://hdl.handle.net/11449/177517
Origin: Oasisbr
Subject(s): Diffuse reflectance spectroscopy; Lead; Progressive hair dye; Spot test; Diffuse reflectance spectroscopy; Diffuse reflectance spectroscopy; Lead; Lead; Progressive hair dye; Progressive hair dye; Spot test; Spot test
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
A simple, inexpensive, and clean methodology employing a combined spot test/diffuse reflectance spectroscopy procedure was developed and applied for the quality control analysis of lead in hair dyes, using a filter paper platform. The method is based on the complexation reaction of lead, present in a pH 2.8 buffer medium containing tartaric acid and sodium and potassium tartrate, with sodium rhodizonate (ROD) in an aqueous medium containing sodium dodecyl sulfate (SDS) surfactant, yielding a colored compound on the surface of a filter paper. The concentrations of ROD and SDS were optimized using experimental design. The linear range obtained for reflectometric measurements carried out at 545 nm was 4.70-140 mg L-1 of lead (R = 0.998), and the limits of detection and quantification were 1.12 and 3.75 mg L-1 , respectively. The proposed method was successfully applied to the analysis of lead in progressive hair dyes.
Instituto de Química, Universidade Estadual Paulista, UNESP, Rua Prof. Francisco Degni 55, CP 355
Instituto de Química, Universidade Estadual Paulista, UNESP, Rua Prof. Francisco Degni 55, CP 355
